Wow.. this seems to be a yes you can, no you can't topic and I don't know what to do... I know that it costs about $200 for an aftermarket pulse generator. I would love to not have to buy one of these. That radio harness, are you talking about the Rockford setup or is the harness the same on all the stock systems? I wish I had the time to do all this but I have a friend at a car audio store to do this stuff for me. I will have him look at the harness and post back if this works. GPS is working for me right now but it doesn't tell me when to turn and it looks like I am driving through peoples' lawns. Anyways, keep posting if you know more... Thanks